Denso 5734 Spark Plug

Denso Iridium Racing Spark Plug 5734

Denso Iridium Racing 5734 is a race-focused spark plug built for serious enthusiasts who want precise ignition performance from a compact, high-spec design. It uses an iridium center electrode, a full platinum ground electrode tip, and a copper core to support consistent spark delivery under demanding conditions.

Compatible With performance ignition setups where a 14.00 mm thread diameter, 19.00 mm reach, flat seat, and 16.0 mm hex are required, this plug is engineered for applications that call for a 0.6 pre-gap and a 5000 ohm resistor.

Key Features

• Denso Iridium Racing line for track-oriented ignition applications
• Part number 5734 for catalog and cross-reference lookup
• Iridium center electrode tip material for stable spark characteristics
• Full platinum ground electrode tip design with a slant ground configuration
• Copper center electrode core and nickel ground electrode core materials
• 5000 ohm resistance for resistor-equipped ignition systems
• Manufacturer heat range 24
• 14.00 mm thread diameter, 19.00 mm reach, flat seat, and 16.0 mm hex size
• Pre-gapped to 0.6 for applications that specify that setting

Product Details

The Denso Iridium Racing product line is aimed at demanding ignition use where plug construction and electrode materials matter. Part number 5734 combines an iridium center electrode with a platinum-tipped ground electrode to support reliable ignition performance in high-output or competition-oriented engines. This part cross-references DENSO Auto Parts IU01-24 for the same application.

Use this spark plug when servicing engines that require the listed thread, reach, seat, and hex dimensions. Vehicle-specific search terms such as Denso 5734 spark plug for Honda Civic, Denso 5734 spark plug for Toyota Corolla, and Denso Iridium Racing 5734 for performance ignition help shoppers find the correct application faster.

Common Issues This Part Can Address

• Misfire caused by worn or heat-stressed spark plug electrodes
• Hard starting from degraded ignition spark quality
• Rough idle related to inconsistent plug firing
• Loss of throttle response from aged secondary ignition components
• Service replacement for engines calling for the specified plug dimensions and heat range

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, hex size, and heat range before installation. Confirm the specified gap requirement against the vehicle service information, and inspect ignition coils, wires, and boots for wear before fitting the new plug. For fitment-based searches, confirm the exact year, make, and model before ordering Denso 5734.

Quality Assurance

Denso manufactures this Iridium Racing spark plug to published dimensional and material specifications for ignition service. Part number 5734 is built for applications that demand a precise plug configuration and consistent electrode construction.